'all', fontawesome-all.min.css
' fontawesome-all.min.css
' ( ) 'family' @font-face{font-family:**Font Awesome\ 5 Free**;font-style:normal;
, , content: "\f0c8";
, ( ) font-family: Font Awesome\ 5 Free;
.
.frb input[type="checkbox"] ~ label:before {
font-family: Font Awesome\ 5 Free;
content: "\f0c8";
font-weight: 900;
position: absolute;
}